Research & Guides

The peptide library, written by clinicians.

62 long-form articles on peptide therapy — what each compound does at the cellular level, who it's for, what the FDA says about it, and where the gray-market vendors get the story wrong. Every guide is reviewed by a US-licensed physician and updated as evidence evolves.

Articles

How Long Does Tirzepatide Stay in Your System? The Label Arithmetic

How long does tirzepatide stay in your system? About 25 to 30 days after a final dose, derived from the roughly 5-day half-life on the Zepbound and Mounjaro labels.

Dr. Richard Dentico, MD · 12 min read

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A glass hourglass with dark sand running, on a dark tabletop against a pale textured wall

Weight Loss · 12 min read

How Long Does It Take for Tirzepatide to Start Working? What Trials Measured

How long does it take for tirzepatide to start working? Blood levels peak 8 to 72 hours after an injection. Trials measured lower food intake at week 3 and weight loss by week 12.

A Protocol MD compounded tirzepatide vial standing on a glass shelf inside an empty refrigerator

Weight Loss · 11 min read

How Long Does Tirzepatide Last in the Fridge? What the Labels Say

How long does tirzepatide last in the fridge? Zepbound and Mounjaro keep to their printed expiration date at 36°F to 46°F. A compounded vial follows the beyond-use date on its own label.

An unoccupied analog bathroom scale on a dark floor with the needle at rest

Weight Loss · 14 min read

Why Am I Not Losing Weight on Tirzepatide? A Physician's Guide

Why am I not losing weight on tirzepatide? Usually the timeline, a noisy scale, or appetite rising to meet the weight you already lost. What a physician reviews when the scale stops.

An unlabeled glass medication vial and a syringe on a blue background

Weight Loss · 10 min read

Is Zepbound the Same as Tirzepatide? Brand, Generic and Compounded

Is Zepbound the same as tirzepatide? Zepbound is a brand name for tirzepatide. Mounjaro is the same molecule for type 2 diabetes. Compounded tirzepatide is a different product.

Amber glass vial on a clean white surface — glutathione's measurable changes are biochemical, not photographic

Longevity · 11 min read

Glutathione Before and After: What Actually Changes, and What Does Not

Most glutathione before-and-after pages are skin-lightening galleries. That is the use with the thinnest evidence and the clearest safety warnings. Here is what a physician would tell you actually changes — and why it is not something a camera can capture.

Swimmer gliding through a lane seen from above

Longevity · 12 min read

Sermorelin Benefits: What the Evidence Supports, Graded Honestly

Most "sermorelin benefits" pages are a bulleted wish list. This one grades each claimed benefit by the strength of the evidence behind it, answers the cancer question directly, and explains why the molecule's ceiling is your own pituitary.

503A US Pharmacy
Physician-Prescribed
USP-Compliant Compounding

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